Pneumatic Connection; Setting The Actuator - Samson 3276-D Mounting And Operating Instructions

Installation
compression in the actuator' in the
'Removal' section.
NOTICE
!
Risk of actuator damage due to excessively
high or low tightening torques.
Observe the specified torques when tighten-
ing actuator components. Excessive tighten-
ing torques lead to parts wearing out more
quickly. Parts that are not tightened far
enough may loosen.
Î Observe the specified tightening torques.
NOTICE
!
Risk of actuator damage due to the use of
unsuitable tools.
Î Only use tools approved by SAMSON.
5.2.1

Pneumatic connection

a) Version D, fail-open (actuator
stem retracts)
1. Apply a signal pressure that corresponds
to the upper signal pressure range value
to the connection on the top diaphragm
case (850) to extend the actuator stem.
5-2
b) Version R (actuator stem ex-
tends)
1. Apply a signal pressure that corresponds
to the lower signal pressure range value
to the connection on the bottom dia-
phragm case (900) to retract the actuator
stem.
2. Screw the vent plug into the exhaust port.
5.2.2

Setting the actuator

The bench range is set before mounting the
actuator onto the valve.
If the actuator travel and the valve travel are
the same, the lower signal pressure range
value is the same as the minimum value of
the bench range or operating range. The up-
per signal pressure range value is the same
as the maximum value of the bench range or
operating range.
If the valve travel is smaller than the actuator
travel, the values for the bench range are
different. Version D: the upper signal pres-
sure range value is lower. Version D: the
lower signal pressure range value is higher.
These details are specified on the nameplate
(see the 'Markings on the device' section).
Before setting, make sure the following con-
ditions are met:
− The spring adjuster (906) is unthreaded
to the point at which the actuator spring
(595) is not loaded.
− The air is connected but no air is applied
to the diaphragm chamber.
EB 8318 EN